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Ultrawide on Linux: can you tell a game to take up only the "middle"?
(discuss.tchncs.de)
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Doing this in reverse all the time. Stretching games on my triple head setup to full size. It's the same principle. If the game doesn't offer it kill it with gamescope, Wine virtual desktop or if nothing helps a completely virtual display that overlays your current:
https://beko.famkos.net/2021/05/31/extreme-multihead-for-gaming-on-linux-pc/
For some editing the config files directly works wonders. Looking at you Unity!